Document and Entity Information |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Document and Entity Information | |
| Document Type | 11-K |
| Entity Registrant Name | Valmont Industries, Inc. |
| Entity Central Index Key | 0000102729 |
| Amendment Flag | false |
| EMPLOYEE RETIREMENT SAVINGS PLAN | |
| Document and Entity Information | |
| Document Type | 11-K |
| Amendment Flag | false |